Oil burner



June 16, 1925.

G.' SAWYER OIL BURNER Filed 1366.3, 1923 ooooQ fi o o ooo voo o oPatented .lune 16, 1925.

GEORGE SAWYER, F ATLANTIC, MASSACHUSETTS.

on. BURNER.

Application led December 3, 1923. Serial No. 678,137.

To all wwm t may concer/n:

Be it known that I, GEORGE SAWYER, a citizen of the United States, and aresident of Atlantic, in the county of Norfolk, Commonwealth ofMassachusetts, have invented certain new and useful Improvements in OilBurners, of which the following is a .full and exact specification. v

The objects of this invention, are, irst, to simplify and render moreefficient the burner itself, and, second, to provide means whereby thefuel oil therefor cannot be turned on without a previous heating of theburner.

In the accomplishment of these objects I provide an electric heatingmeans loca directly beneath and in close contact with the oil receivingchannel, and so arrange the switch therefor that the oil cannot beturned on until after the switch hasbeen made to cut in the heatingcurrent.

.In the drawings forming part of this specification, Fig. 1 is a centralvertical section of a burner embodyingmy improvements. Fig. 2 is a planview of the same partly in section.

The burner comprises an annular oil receiving channel 1 at the baser ofand surrounding an air dome 2. Through the side walls of this dome'arenumerous perforations 3 for the purpose of admitting air from within thedome to the space above the channel 1. In the outer edge of the channelis an annular groove 4 for receiving the lower ed e of a shell- 5 alsohaving perforations 3 t rough it; and integral with this shell is ajacket 6 spaced therefrom and having its lower edge at about the levelof that of the shell 5 but open thereat in order to admit air to theperforations in this shell. The u per ed e 7 of the jacket 6 is curvedinwar somewIiat in order to concentrate the ame. Y

Thus constructed, an annular moat 9-with the channel 1 as its bottom, isformed about the dome 2, into which the fuel oil is admitted through asuitable valve, as the needle valve 10.

Beneath lthe channel 1 is an annular groove 11 designed to contain theelectric l heater element comprising a resistance helix 12. The ends ofthis helix are shown in Fig. 2 as emerging from the groove 11 near theneedle valve .10, and are connected through a switch 13 with a suitablesource of current. This switch is of any well known form, but ispreferably one operated by a switch button 14 which is flat. Thehandpiece 15 of the valve is 'provided with a radial lug 16 disposed tocome against the flat surface of the button 14 when the latter is in itscut-out position. Hence when the valve is turned the lug 16 will notpass the button 14 until after the latter hasbeen manipulated to cut thecurrent into the helix ted 12.

I prefer to place a thin ring of mica 1,7 between the helix 12 and theoor of the channel 1, such fioor being made very thin to enable the heatto strike through quickly. The helix being ut into contact with themica, it is secure in place in any suitable way, but preferably by meansof silicate of soda.

The operation of this burner is as follows: The switch button 14 havingbeen turned to admit current to the helix 12, the'channel 80 floor in amoment or two is rendered red hot; and the hand-piece 15 can be turnedto permit a stream of oil to the channel. This oil instantly ignites,and as the flame rises throughout the moat 9, air is drawn in throughthe perforations 3 both of the dome 2 and of the shell 5, and, by itsunion with the flaming hydrocarbon, renders the combustion practicallyperfect, so that not onl is a maximum of heat obtained for the o1l 90consumed, but there will be no unpleasant or injurious gases emittedtherefrom.

The purpose of the jacket 6 is to supply the air in as heated acondition as possible to the perforations 3 of the shell 5;` a like 95function being performed by having the I dome 2 nearly closed at itstop` As soon as the oil is burning satisfactorily, the current isswitched off from the helix 12. When through with the burner, the switchbutton 14 must be turned for a moment to permit the hand-piece 15 tojberotated for closing the valve 10, but as soon as closed the button 14 isto be turned on again.

What I- claim as my invention is:

.A burner comprising a shallow moat for receiving the fuel to beconsumed, said moat having a concave bottom made very thin at 5 itslowermost section, and an electrically heated helix supported close' tosaid thin section but beneath the 'same and insulated electricallytherefrom, whereby the oil fed into said moat is ignited along saidconcave thin section of the same. 10

In testimony that I claim the fore oing invention, I have hereunto setmy han this 30th day of November, 1923.

GEORGE SAWYER.

